Graphic user interface for a portion of a display screen



The FIGURE is a front view of a graphic user interface for a portion of a display screen showing my new design.

The broken line showing of a region and the unshaded area there within forms no part of the claimed design. The broken line showing the display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a graphic user interface for a portion of a display screen, as shown and described. 